Insulation-forming machine



Nov. 5, 1929. v R. w. BAKER INSULATION I FORMING MACHINE Original Filed Marfch 15, 1926 3 Sheets-Sheet 1 v 3mm M M 1154/ mummy Nov. 5, 1929.

R. W. BAKER I INSULATION FORMING MACHINE Original Filed March 15, 19,26

3 Sheets-Sheet 2 gmawto o Nov. 5, 1929. R. w. BAKER INSULATION FORMING MACHINE 3 Sheets-Sheet 3 Original Filed March 15. 1926 Patented Nov. 5, 1929 RUSSELL W. BAKER, OF ANDERSON, INDIANA, ASSIGNOR, BY MESNE ASSIGNMENTS,

T0 DELGO-REMY CORPORATION, OF DAYTON,

OHIO, A CORPORATION OF DELAWARE INSULATION -FORMING IVIACI-IINE Application filed March 15, 1926, Serial No. 94,989. RenewedApril 3, 192 8.

This invention relates to the manufacture of armatures for dynamo-electrc machines and more particularly to the manufacture of parts for insulating the armature core teeth.

One object of the present invention is to provide a process and machine by which insulating members of this type may be produced with great rapidity so that the cost of this part of manufacturing an armature will be materially reduced.

F urther. objects and advantages of the present invention will be apparent from the following description, reference being had to the accompanying drawings, wherein a preferred form of embodiment of the present invention is clearly shown.

In the drawings:

Figs. 1 to 7 inclusive are views partly in section showing different steps in the process of folding a strip of flat insulating paper so as to form an armature core toot-h insulating member of the desired shape. These views are taken respectively on the lines 1-1, 22, 33, 4-4, 55, 66 and 77 of Fig. 10.

Fig. 8 is a side view of a strip of insulating material formed by the present invention.

Fig. 9 is a fragmentary view on an enlarged scale of an armature which is insulated by members manufactured by the present inven tion.

Fig. 10 is a plan view partly in section of a machine for carrying out the process illustrated by Figs. 1 to 7 and for cutting the folded strip into the desired lengths.

Fig. 11 is a side view looking in the direction of arrow 11 in Fig. 10.

Fig. 12 is an end view in the direction of arrow 12 of Fig. 11.

Figs. 13 and 14 are bottom plan and end view respectively of the upper paper folding members shown in Figs. 4, 5, 10 and 11.

Figs. 15 and 16 are top plan view and end view respectively of the lower paper folding member shown in Figs. 2, 3, 4, 5, 10 and 11.

Referring to the drawings, one type or form of insulating member which may be produced by the present invention is shown in Figs. 7 and 8. This member designated in its entirety by numeral 20, comprises a web portion 21 which oins the leg portions 22 which are L-shaped in cross section. These pieces are applied to an armature core indicated by numeral 23 in Fig. 9, in the following man ner: A. substantially V-shaped strip of insulating material 24 is inserted within each core slot 25 to provide an insulating lining for the bottom of the slot and portion of the sides of the slot which are defined by the shanks 26 of the core teeth; Then an insulating member 20 is placed around each core toothas shown in Fig. 9 so that its Web portion 21 engages the periphery of a core tooth and its leg por 'tions 22 engage the sides of the shank 26 and overlap the sides of insulating pieces 24. Armature coil windings 27 are placed within the slots 25 and these windings will crowd the portions 22 against'the sides of the core teeth to cause them to conform to the shape of the shank 26. Since the parts 22 and 24 are separated and overlapping, these parts may slide relative to each other as the windings are applied to the cores, so that these members may adapt themselves to the shape of the core teeth. After the windings have been applied the insulating pieces 20 are severed at the edges 28 of the core teeth so that the superfluous portions 21 may be removed, leaving only the slot lining portions 22.

The mechanism for folding the strip insulation as shown in Fig.7 will be first described. The machine comprises a base 30 which supports brackets 31, 32, 33, 34, 35 and 36. The brackets 31 and 32 support a U-shaped member 37 (see Fig. 1) having a convex forming surface 38 over which the paper strip 200 is pulled in order to cause it to bend in'a convex manner as viewed'from the top of the machine. The paper passes from the forming member 37 into a recess 39 provided by a block 40 (see Figs. 2 and 15) which is secured to thebrackets 31, 32, 33 and 34. The recess 39 is defined by a horizontal bottom wall 41 and straight converging side walls 42 and 43. As the strip 200 moves toward the left, the side edges will be brought together gradually. Fig. 3 illustrates the position of a sectionof the.strip at the line 33 of Fig. 10. The side walls 42 and 43 merge into parallel vertical walls 44 and 45 respectively which define a narrow channel having a bottom wall 46 which merges with bottom wall 41 of the recess 49 and is clownwardly inclined toward the left as viewed in Fig. 11. The side edges of strip 200 are forced into this narrow channel and against the bottom wall 46 thereof by a folding member 50 attachedby screws 51 to the member and provided'with a central channel 51 which is a segment of acircle in cross section and diminishes in cross sectional dimensions as the work proceeds from the right toward the left of the machine. Vhen the strip 200 enters the narrow channel defined by the walls 44, and 46 its shape will be approximately as shown in Fig. 4. In this position the arch of its loop is engaged by. the top wall of channel 51. As the work progresses from the. section line 44 to section line 55 of Fig. 10 the loop formed by the paper is gradually changed in'sectional shape from a vertical ellipse as shown in Fig. 4 to a horizontal ellipse, as shown in Fig. 5. The loop is finally flattened, as shown in Fig. 6, by passing the strip between an upper roller and a pair of lower rollers 61. The roller 60 provided with flanges 62 which engage the outer sides of rollers 61. Each roller 61 is provided with a knurled, cylindrical periphery 63 andwith conical surfaces 64- and 6,5, The paper is gripped between the cylindrical periphery 66' of wheel 60 and the knurled cylindrical peripheries 63 of the wheels 61. By providing each wheel 61 with the conical surface the sharp bending of the strip 200 at theportions 201 is prevented. Asshown in Fig. 6 the side edges 202 of the strip are received by the V-shaped groove 67 defined by the spaced conical surfaces 64.

After the strip passes the rolls 60 and 61 it is fed through channels 70 and 71 provided by guide blocks 72 and 73 respectively. These channels together form .a .T-shaped channel conforming tothe approximately T-shaped cross section of the work when the margins 202 are located contiguously. The guide,

block 73 is attached to the guide block 72 by screws 74 and block'72 is attached by screws 75 to the bracket 36. The T-shaped aperture provided by the blocks 72 and 73 merges into a-T-shaped opening in a shear disc 81 which is attached by screws 82 to the bracket 36. A rotating blade 83 cooperates with'the shear disc 81 to sever sections of. the folded strip into pieces of the desired length, as shown in Fig. 8. The blade 83 is provided by a rotating bar 84having a beveled end 85 which, like the blade 83, conforms to the conical surface 8.6 of the shear block 81. The bar 84 is supported'for rotation by a shaft 87 journaled in bearings 88 provided by the bracket 36, and is slidably connected with the shaft by means including a sleeve 89 attached by key 90 to the shaft 87 and secured endwiseby a nut ,91. The sleeve 89 is provided with a groove 92 co-operating with a spline 93 attached to the bar 84. A spring 94 located between the bar 84 and a flange 95 carried by the sleeve 89 causes the bar to be yieldingly urged against the shear disc 81.

The forming wheels and the bar are rotated by a mechanism which includes a belt driven pulley upon the shaft 101 which is supported by bearings 103, 104 and 105 carried by brackets 33, 34 and 35 respectively. The shaft 101 is drivingly connected with the .wheel 60 a spur gear 106 and a bevel gear 107. The bevel gear 107 meshes with a bevel gear 108 connected with shaftg87 in order that the cutter 83 may be rotated by the pulley 100. The gear 106 meshes with a geerioe connected with a-shaft 110 which'is supported by bearings 111 and 112' supported and guided by the brackets 33 and 34 respectively. Each of the bearings 111 and 112 is urged .upwardly by a spring 113 so that the wheels 61 will be yieldingly urged toward the wheel 60. In this manner the paper strip will be yield.- ingly gripped between the rollers as shown in Fig. 6.

A machine may be adapted for cutting insulation pieces 20 of various lengths within certain limits. This is accomplished by substituting for the spur gears 106 and 109 and for the feeding wheels 60 and 61 other gears and wheels of different diameters." If the diameters of the gears and feedingwheels are less than represented in the drawings, the

distance from the base 30 to the folded strip as it leaves the feeding wheels will be greater 'than that represented by Figs. 11 and 12. Therefore, the distance between the base and the guide members 72 and 73 and the guiding slot in the shear disc 81. must be correspondingly increased. This is accomplished by removing the screws 82 which secure the shear disc to the bracket 37, by turning the disc for example, 90 clockwise and then reree placing'the screws. In this new position of the disc 81 another T-shaped passage 80 will be brought into alignment with the folding mechanism in order to receive the folded ma? terial at a different vertical distance from the base 30. The distance from the passage 80 to the center lineof the screw holes through which the screws 82 extend is such that when four passages 80 which vary in distance from the diametrically center lines of the screw holes in the disc. Quite obviously if the disc were secured by the siX equi-distant screws 82' the disc could be mounted in six different positions and might be provided withsix passages 80. 'As the block 72 isprovided withf slots 72 for receiving the screw 75 it maybe adjusted vertically in order that the T-shaped passage provided by the blocks 72 and 73 may be aligned with the passage in the shear disc 81.

It will be noted that the passage 80 is located so that each portion of the folded strip passing therethrough will be oblique to the edge of the blade 83 as it rotates in a clockwise direction, as viewed in Fig. 12. Therefore, during the cutting of the folded paper each portion is adequately supported by the shear block as the blade cuts into it. As the paper is moving while being sheared it may not be severed exactly at right angles to its long dimensions, but this is immaterial since the paper strip is preferably longer than the arr mature core and its ends will project beyond the end insulation of the core.

While the form of embodiment of the present invention as herein disclosed, constitutes a preferred form, it is to be understood that other forms might be adopted, all coming within the scope of the claims which follow.

That is claimed is as follows:

1. A machine for forming insulation pieces from flat sheet material which comprises means for folding the material; cutting means which includes an apertured shear block through which the material is guided, and a rotary cutter cooperating with the block.

2. A machine such as defined by claim 1, in which the cutting means includes an apertured shear block through which the material is guided, and a rotary cutter cooperating with the block, the block and cutter having engaging surfaces oblique to the line of motion of the strip for the purpose specified.

3. A machine such as defined by claim 1, in which the folding and feeding apparatus includes feeding and folding rolls interchangeable with other rolls of different diameters, and the shear plate included in the cutting means is adjustably mounted and is provided with various holes for receiving the folded strip, in order that the machine may be adapt ed to form insulation pieces of different lengths.

4. A machine such as defined by cailm 1, in which the feeding and folding means comprises means for folding the paper so that the side marginal portions are contiguous and the intermediate tubular portion is uncreased, and feed rollers for flattening the intermediate tubular portion so that it is locat d in planes at right angles to the planes of the contiguous marginal portions.

5. The method of folding a flat strip of paper to provide a piece having a cross-section characterized by av web portion 'joinin substantially Lshaped flanges, one leg OI each flange abutting the web. and the other legs contiguous, which consists in bringing the side marginal portions together without creasing the intermediate portion forming a tubular portion, and in flattening the intermediate tubular portion so that it is located in planes substantially at right angles toth e planes of the contiguous side marginal por tions.

6. The method of folding a flat strip of paper to provide a piece having a cross section characterized by a web portion joining substantially L-shaped flanges, one leg of each flange abutting the web and the other legs contiguous, which consists in bringing the side marginal portions together to form the paper so that it will be horse-shoe shaped in cross section, then, while maintaining the arms so formed parallel, moving them into closer proximity to each other and forming the curved portion into a vertical ellipse, then by rolling, maintain the arms'parallel while gradually changing the vertical ellipse into a horizontal ellipse and then into a flattened loop lying in' a plane substantially at right angles to the adjacent parallel flanges.

7. A machine for forming pieces from flat sheet stock, which comprises, means adapted continuously to feed stock into the machine, means for folding the stock, and means for cutting off proper lengths from the folded stock, said means comprising an apertured block through which the stock is fed, and a cutting knifecooperating with said block, both cutting knife and block having engageable cutting edges, oblique to the line of movement of the stock. i I

8. A machine for forming pieces from flat sheet stock, which comprises folding means .having members for folding the stock so that the side marginal portions are contiguous and theintermediate portion is uncreased, feeding means comprising rollers for flattening the intermediate, uncreased portion so that it is located in planes at right angles to the plane ofthe contiguous marginal portions, and means for cutting off proper lengths of the formed stock.

9. llhe method of folding a flatstrip of paper to provide a piece having a cross section characterized by a web portion joining substantially L-shaped flanges, one leg of each'flange abutting the web and'the other legs contiguous, which consists, bringing the side marginal portions toward each other forming a curved intermediate portion, flattening the curved intermediate portion while maintaining the said marginal portion in con tiguous relation, said intermediate portion being flattened into a plane transverse to the planes of the side marginal portions.

10. The method of folding a flat strip of paper to provide a piece having a crosssection characterized by a web portion joining substantially L-shaped flanges, one leg of each flange abutting the web and the other legs contiguous, which comprises, simultaneously bringing the side marginal portions toward each other to form a curved inter mediate portion, then flattening said curved intermediate portion in a plane transverse to the marginal portions while maintaining the marginal portions in contiguous relation.

11. A'method of folding a flat strip of paper to provide a piece having a' crosssection characterized by a web portion join ing substantially .L-shaped flanges, one leg of each flange abutting the web and the other legs contiguous, which comprises, bringing the side marginal portions together without 10 creasing the consequently arched intermediate portion, then flattening said arched intermediate portion, so that it comprises jux taposed portions of paper located in planes substantially at right angles to the planes of the contiguous side marginal portions.

12. The method of folding a flat strip of paper to provide a piece having a cross-section characterized by a web portion joining substantially L-shaped flanges, one leg of each flange abutting the Web-and the other legs contiguous, which comprises, bringing the side marginal portions together to form the paper so that it will be horse-shoe shaped in cross-section, moving the said portions closer together 'to form the curved part of the paper into a vertical ellipse, rolling the vertical ellipse'into a horizontal ellipse and gradually flattening the paper forming said ellipse into a plane lying substantially at 39 right angles to the side marginal portions.

13. The method of folding a flat strip of paper to provide apiece having a T-shaped cross-section which consists of bending the strip to bring the side marginal edges toward v a each other, forming a U-shaped structure having substantially parallel branches joined by a substantially semi-circular arched portion, then drawing the parallel branches to-' gether while holding them substantially'parallel the arch being shaped into an ellipse,

then while maintaining the branches in juxtaposed, parallel relation flattening the elliptical web portion so that substantially parallel I l strip portions. are provided practically at V right angles to the juxtaposed parallel branch portions, then while maintaining the strips in this formation, severing it to provide formed strips of proper length.

In testimony whereof I hereto afiix my sig- 505 nature.

RUSSELL w; BAKER. 

